* [PATCH] clk: imx: use sign_extend32() and abs()
@ 2015-09-29 11:32 Martin Kepplinger
2015-10-01 23:39 ` Stephen Boyd
0 siblings, 1 reply; 2+ messages in thread
From: Martin Kepplinger @ 2015-09-29 11:32 UTC (permalink / raw)
To: shawnguo, kernel, mturquette, sboyd
Cc: linux-arm-kernel, linux-clk, linux-kernel, Martin Kepplinger
This simplifies the given function by getting rid of the manual
sign extension as well as saving an absolute value in an extra
variable.
Signed-off-by: Martin Kepplinger <martink@posteo.de>
---
built and run, but please review.
martin
drivers/clk/imx/clk-pllv2.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
diff --git a/drivers/clk/imx/clk-pllv2.c b/drivers/clk/imx/clk-pllv2.c
index 20889d5..b18f875 100644
--- a/drivers/clk/imx/clk-pllv2.c
+++ b/drivers/clk/imx/clk-pllv2.c
@@ -77,7 +77,7 @@ struct clk_pllv2 {
static unsigned long __clk_pllv2_recalc_rate(unsigned long parent_rate,
u32 dp_ctl, u32 dp_op, u32 dp_mfd, u32 dp_mfn)
{
- long mfi, mfn, mfd, pdf, ref_clk, mfn_abs;
+ long mfi, mfn, mfd, pdf, ref_clk;
unsigned long dbl;
s64 temp;
@@ -87,19 +87,15 @@ static unsigned long __clk_pllv2_recalc_rate(unsigned long parent_rate,
mfi = (dp_op & MXC_PLL_DP_OP_MFI_MASK) >> MXC_PLL_DP_OP_MFI_OFFSET;
mfi = (mfi <= 5) ? 5 : mfi;
mfd = dp_mfd & MXC_PLL_DP_MFD_MASK;
- mfn = mfn_abs = dp_mfn & MXC_PLL_DP_MFN_MASK;
- /* Sign extend to 32-bits */
- if (mfn >= 0x04000000) {
- mfn |= 0xFC000000;
- mfn_abs = -mfn;
- }
+ mfn = dp_mfn & MXC_PLL_DP_MFN_MASK;
+ mfn = sign_extend32(mfn, 26);
ref_clk = 2 * parent_rate;
if (dbl != 0)
ref_clk *= 2;
ref_clk /= (pdf + 1);
- temp = (u64) ref_clk * mfn_abs;
+ temp = (u64) ref_clk * abs(mfn);
do_div(temp, mfd + 1);
if (mfn < 0)
temp = -temp;
--
2.1.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] clk: imx: use sign_extend32() and abs()
2015-09-29 11:32 [PATCH] clk: imx: use sign_extend32() and abs() Martin Kepplinger
@ 2015-10-01 23:39 ` Stephen Boyd
0 siblings, 0 replies; 2+ messages in thread
From: Stephen Boyd @ 2015-10-01 23:39 UTC (permalink / raw)
To: Martin Kepplinger
Cc: shawnguo, kernel, mturquette, linux-arm-kernel, linux-clk, linux-kernel
On 09/29, Martin Kepplinger wrote:
> This simplifies the given function by getting rid of the manual
> sign extension as well as saving an absolute value in an extra
> variable.
>
> Signed-off-by: Martin Kepplinger <martink@posteo.de>
> ---
Applied to clk-next
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
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